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March 12, 1929. e. w. HAZLEWOOD SLOW COMBUSTION HEATING STOVE Filed Jan. 27, 192'? Patented Mar. 12,1929.

UNITE s GEORGE WILLIAM 'HAZLEWOOD, or BIRMINGHAM, EnGLANn, I r j LIMITED, or BIRMINGHAM, EN LAND;

SLOW-()O1\L[BUSTION HEATING STOVE.

Application filed January 27, 1927, Serial No. 163,998, and in Great Britain November 6, 1926.

charged is withdrawn thereby leaving an air shaft-or passage in the mass of fuel and extending vertically therethrough. v

The invention consists of a new or improved construction of stove of the kind re? ferred to and is characterized by the arrange- 207 ment of the combustion chamber or fuel receptacle in an outer casing to which the heated air and products of combustion are conducted from the fuel receptacle or com-- bustion chamber and thence or conduit. p

The invention will be further described with reference to the accompanying drawm s. t i

%igure 1 represents, partly in elevation and partly in vertical section, a slowcombustion heating stove constructed in accordance with the invention, the stove being charged with sawdust or like comminuted fuel ready for use. I V

Figure2 is a sectional plan of the same, the section being takenon the plane indicated by the dotted line 22.Figure 1. The charge of fuel is not indicated in this figure. Figure 3 is a vertical longitudinal section to an outlet fine 40 on the plane indicated by the dotted line '33 Figure 2, the former being shown in the position which it occupies when the stove is being charged with fuel. 1

The same numerals of reference indicate 7 the same or corresponding parts in the several figures of the drawings.

7 In the embodiment of the invention .illus-' trated, 10 is the outer casing of the stove, the said casing beingconveniently constituted by a cylindrical body of sheet metal and benected therewith the mannerhereinafter assrenon fro WALLS more particularly described. The said base plate or ash-pan may be of cast or wroughtron or other suitable metal and be provided, if desired, with ,feet such as 12 which can be riveted, bolted or otherwise secured thereto.

At one side of the outer casing 10 and adjacent the base plate or ash-pan 11 is a cutaway part or aperture p10? (see Figure 3) adapted'to be closed or opened by a door or flap, as for example, the hingedvflap ll, the hinge pin 14: of whichis mounted on a cast or wrought metal flanged rectangular framelike member 15 the flange lff 'Of'Whl'Chis shaped to fit against the outer casing 10 and may be secured thereto by rivets 16.

Or instead of the hinged closing, door or flap 13 asliding closing member may bejprovided or the closure member ,may be constructed on the hit and miss ventilator principle for the better regulation of the air supply to the stove. e q

Disposed within the outercasing 10 is a diaphragm 17 which may be of castor wrought iron .or other suitable metal, the said .dia-

' phragin having-an area proper to closely fit within the outer casing and being fixed or supported therein at a-level above the top" edge of the air inlet aperture 10 -i-n the casing 10, the support, of the said diaphragm at the requisite height being conveniently effected by the provision .on the underside thereof of the legs or props on the base 11.

The said diaphragm 17 tral aperture'l'l and is providedon its up 17 which rest, I

hastherein a cenper face with an upstanding rib or flange 17 ora series of studs or projections or equivalent means for concentrically positioning withinthe outer casing a second casing 18 preferably of sheet metal which casing con-' stitutes the combustion chamber proper of the stove and is of such crosssectional dimensions that when positioned in the outer casing 10 an annularspace or'chamber 19 is left 3 chamber 19 and by removable sections 20 and 20 which complete the cover the section 20Fbeing of annular formation and the central section 20 of a plate or disc-likeformation, the rim 20 and sections 20 and 20 being furnished with rebated or shouldered peripheries for the engagement and support of the respective parts by each other in a manner well understood. a

The rim section is preferably provided on its underside Withincipient flanges or circular ribs 20 and 20 which respectively serveto position the upper ends of the tubular outer casing 10 and combustion chamber 18 relative to the rim and the said rim section 20 and-base ll are conveniently connected together with the tubular members 10 and 18 securely clamped and positioned between them by the longitudinal wires or rods 21 which extend through the smoke chamber, the upper ends of the said rods being provided with heads which take a bearing in holes in the rim 20 through which the rods are passed and their lower ends, which pass through holes in the base plate 11 coincident with the holes in the rim 20, being screwed for the re ception of screw nuts 22 which on being tightened up on the rods securely brace the parts together. r

- This method of connecting or bracing the parts provides for their ready assembly and permits of theirbeing readi y disassembled for repair or replacement when necessary or desirable. Y

In order to allow the products of combustion to passfrom the combustion chamber 18 the smoke chamber 19 between the same and the outer casing 10 the upper end of the V combustion chamber casing is notched or cut away at one or. more points to provide a gap such as 18 through which the said products escape to the annular smoke chamber whence they pass through a side opening 10 in the outercasing toa flue pipe (not shown) in connection therewith, said opening 10 to the fluepipe being disposed at or near the lower end ofthe annular chamber and preferably at the-side of the stove opposite to that at which the door regulated aperture- 10 through which air is admitted is located.

For convenience of connection of the stove with a flue pipe prefer to provide the opening 10*- with a short tubular extension 23 adapted to fit against and be riveted or otherwise fixed on the casing 10, the said extension the combustion chamber casing.

which constitutes the bottom of the combustion chamber and to facilitate the-positioln ing operation the lower end of the rodis provided with a wood or other plug 25?. When the said rod or tubeis so arranged it extends axially upwards through the combustion chamber asis illustrated in Figure 8. The upper end of the rod or tube 25 may be provided with a loopv or handle to facilitate its manipulation. 7

By employing a tubular rod 25 not only is there a reduction in weight effected but the said tube-mayserve as-a receptacle for the tool 26 which'is provided for tamping down the fuel when charging'the stove, which can when the tool is not in use, and for convenience of transit or storage, be insertedwithin the tube as will be understood from an examination of Figure 3 in which figure the tamping tool is indicated in dotted lines, the "tool being completely accommodatedin the tube, its handle 26 only projectingtherefrom;

. V3 hen charging the stove the sections 20 and 20 of the cover are removed and'therod or tube is arrang'ed'in the axis of the combus tion chamber as above described; The sawdust or like comminuted fued marked'27 is introduced from the opened upper end of the combustion chamber and is rammed or tamped down around the rod by the-use of the tool 26, until it fills the annular space between the rod and the inner wall surface of When the combustion chamber has been filled to or near to the upper end thereof the axial rod or tube 25 is withdrawn and the fuel left in the combustion chamber withan axial passage 27 extending therethrough and in alignment with the-aperture 17 in the base'of the combustion chamber which base constitutes the grate of the stove. After charging and removal of" the axial rod or tube the upper end of the stove is closed by replacement of the looseusection or sections of the lid. Any convenient form of luting may be provided if thought necessary or desirable between the rim 20 and the 'upper ends of the casings 10 and 18. i

The stove is set in operation by the burning of paperor other convenient fuel on the ash-pan 11 below the diaphragm 17 or other convenient means of star-ting'the' combustion of the sawdust or the like may be adopted, and when the combustion of the sawdust or the like has been started it will slowly continue toburn so long as air is admitted to the lower end of the stove, 'untilthe whole of thesawdust orlike block" 27 has been burnt, and as hereinbefore stated the products of combustion pass from the combustion cham ber 18 to the smoke chamber 19 around the same and thence through the opening; 10 to tion and as the stove is merely consuming waste products the use of stoves in accordance with the invention is attended with a con said base, a side opening provided in said,

casing adjacent the base, a hinged door for said opening, a horizontal diaphragm fitted within said outer casing and located at a level above the said side opening and spaced from said base, a centrally disposed aperture in said diaphragm, a cover adapted to fit over the upper end of the outer casing, an inner cylindrical tubular sheet metal member concentrally disposed within saidouter casing the lower end of the said member abutting the underside of the cover, an annular space between the inner tubular member and the inner surface of the outer casing, an aperture in the upper end of the tubular member for placingthe said member in communication with the said annular space, a fine opening formed in the outer casingabovethe level of the horizontal diaphragm and tie rods adapted to pass through the annular space and to press and hold together the base, outer casing, inner tubular member and cover said tie-rods being Wholly concealed from View when the stove is erected.

2. A stove for burning sawdust and like comminuted fuel comprising a base, an outer cylindrical sheet metal casing mounted on 7 said base, a side opening providedin said casing adjacent the base, a rectangular apertured frame riveted to the said outer casing adjacent the side opening therein so that the aperturein the frame coincides with the side opening, a door 'hingedly connected to the said frame for controlling the passage of air through't-he side opening, a horizontal dia- 'phragm fitting within said outer casing,land

located at a level above the sideopening and spaced from said base, a centrally disposed aperture in said diaphragm, a cover adapted to-fit over the upper end of the outer casing, an inner cylindrical tubular sheet metal member concentrically disposed within said outer casing the lower end of the said member abutting the underside of the cover, an annular space between, the inner tubular member and the inner surface of. the outer casing, an aperture in the upper end of the inner tubular member for placing the'said member in communication with the said annular space, a flue opening in the outer casing above the level of the horizontal dia:

phragm' and diametrically opposed to i the aforesaid side opening in the outer casing, a flanged flue pipe riveted tothe outer casing so that it registers with the flue opening, a

damper plate pivotally mounted within said flue pipe, an externally disposed handle for controlling said damper plate and tie rods adapted to pass through the annular space and to pressand hold together the base, outer casing, inner tubular member and cover said i tie rods being wholly concealed from. View when the stove is erected.

In testimony whereof, I have signed my name to this s ecification. 7

GE RGE Vlfld lAZLEWQOD. 

